Flow-induced vibration of rod arrays in a jet flow was studied experimentally. The rod arrays tested were on square layout with a pitch-to-diameter ratio of 1.32. The rods were found to vibrate with large whirling trajectories when the jet velocity exceeds a critical value. The effects of axial flow velocity and stand-off distance of the rod array from jet exit were also investigated. A design guide for rod arrays subjected to a jet flow is proposed.

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